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- W3025671908 endingPage "116318" @default.
- W3025671908 startingPage "116318" @default.
- W3025671908 abstract "We determined the silicon isotopic compositions of silicates (olivine and low-Ca pyroxene) in type I and type II chondrules of the carbonaceous chondrites Allende, Kaba, NWA (Northwest Africa) 5958, and MIL (Miller Range) 07342. Type I chondrule silicates show large, mass-dependent Si isotopic fractionations, with δ30Si values ranging from −7‰ to +2.6‰, whereas the δ30Si values of type II chondrule silicates are close to zero and vary by less than 2‰. When present, Mg-rich relict olivine grains in type II chondrules show larger Si variations than their FeO-rich counterparts. In type I chondrules, low-Ca pyroxenes yield systematically lighter δ30Si values than Mg-rich olivines. Our results show that type I chondrules are complex objects whose Si isotopic compositions derived from their precursors and SiO-rich gas-melt interactions. This corroborates that type I chondrules are nebular products that formed under open-system conditions. Our data also suggest that at least some type II chondrules derived from their type I counterparts. Overall, this demonstrates that recycling was common during the evolution of the protoplanetary disk." @default.
- W3025671908 created "2020-05-21" @default.
- W3025671908 creator A5025710432 @default.
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- W3025671908 date "2020-07-01" @default.
- W3025671908 modified "2023-10-15" @default.
- W3025671908 title "Silicon isotopic compositions of chondrule silicates in carbonaceous chondrites and the formation of primordial solids in the accretion disk" @default.
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- W3025671908 doi "https://doi.org/10.1016/j.epsl.2020.116318" @default.
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